One of the symptoms of a broken timing belt is the engine when turned over with the starter will speed up and slow down in a rythmic pattern. Some of the cylinders have valvesâ¦ that are stuck open, so when the starter hits that part the engine will turn over faster, then slower, then faster etc.
Phenol, also known as phenolic acid, is an aromatic organic compound with the molecular formula C6H5OH. It is a white crystalline solid that is volatile. The molecule consists of a phenyl group bonded to a hydroxyl group. It is mildly acidic and requires careful handling due to its propensity to cause chemical burns. Phenol was first extracted from coal tar, but today is produced on a large scale from petroleum. It is an important industrial commodity as a precursor to many materials and useful
- Manufacturers - Materials - Classification. Phenolic - General term used to describe a group of thermosetting resins created by reacting a phenol with an aldehyde, followed by curing and crosslinking. The most common is phenol-formaldehyde. Usually, phenolic is extended by combining it with a filler.